Wear-resistant and anti-cracking environment-friendly power cable

Abstract

The utility model discloses a kind of wear-resistant anti-cracking environmental protection power cable, it is related to power cable technical field, solve the problem of lower wear resistance and anti-cracking performance of power cable in prior art;Including inner core, inner core includes a plurality of array distribution's conductor, the insulating layer of setting on each conductor and the shielding layer wrapped in the outside of insulating layer;Insulating layer includes the insulating inner layer wrapped in the outside of each conductor, the insulating outer layer wrapped in the outside of insulating inner layer and the filling layer setting between insulating outer layer and insulating inner layer gap;Still include: outer sheath structure, setting in the outside of inner core, outer sheath structure includes outer sheath, anti-cracking buffer layer, environmental protection flame-retardant layer and armoring layer;The cable scheme of the utility model can enhance the wear resistance of power cable, improve the structural strength of cable, effectively avoid the cable cracking, wire core exposure and other situations caused by bending, repeated dragging, significantly improve the service life of cable.

Description

Technical Field

[0001] This utility model belongs to the field of power cable technology, and in particular relates to a wear-resistant, crack-resistant and environmentally friendly power cable. Background Technology

[0002] Power cables are cables used to transmit and distribute electrical energy. They are commonly used in urban underground power grids, power plant lead-out lines, internal power supply for industrial and mining enterprises, and underwater transmission lines across rivers and seas. The proportion of cables in power lines is gradually increasing. Power cables are cable products used to transmit and distribute high-power electrical energy in the main lines of the power system, including power cables of various voltage levels from 1 to 500KV and above, and various types of insulation.

[0003] Currently, although existing power cables can meet general power transmission needs, they still have the following shortcomings: Disadvantage 1: The sheath material generally has poor abrasion resistance. By using cross-linked polyethylene (XLPE) to make the sheath, scratches are easily formed on the surface under repeated dragging, sand and gravel abrasion or mechanical impact, which leads to stress concentration, resulting in premature sheath breakage and exposure of the wire core.

[0004] Disadvantage 2: Insufficient crack resistance. Traditional polyolefin or silicone rubber sheaths become brittle at low temperatures, and excessive bending may cause cracks; while cross-linked polyethylene, although having acceptable strength at room temperature, can induce microcracks that penetrate and damage the insulation layer during thermal stress cycling, thereby reducing the cable's service life.

[0005] In summary, existing power cables suffer from relatively low abrasion resistance and crack resistance. Utility Model Content

[0006] This invention provides a wear-resistant, crack-resistant, and environmentally friendly power cable, which can solve the problem of low wear resistance and crack resistance in existing power cables.

[0007] To achieve the above objectives, according to an embodiment of the first aspect of this utility model, a wear-resistant, crack-resistant, and environmentally friendly power cable is provided, comprising an inner core, wherein the inner core comprises a plurality of conductors arranged in an array, an insulation layer disposed on each conductor, and a shielding layer wrapped around the insulation layer. The insulating layer includes an inner insulating layer that wraps around each conductor, an outer insulating layer that wraps around the inner insulating layer, and a filling layer disposed between the outer insulating layer and the inner insulating layer. Also includes: An outer protective layer structure is disposed outside the inner core. The outer protective layer structure includes an outer sheath, a crack-resistant buffer layer, an environmentally friendly flame-retardant layer, and an armor layer. The environmentally friendly flame-retardant layer is disposed between the inner side of the outer sheath and the outer side of the armor layer. The armor layer is wrapped around the outer side of the crack-resistant buffer layer, and the crack-resistant buffer layer is wrapped around the outer side of the shielding layer.

[0008] A further improvement is that each of the conductors is made of tightly twisted aluminum alloy wire.

[0009] A further improvement is that each of the conductors is coated with a nanoscale lubricating layer, which is a graphene composite material.

[0010] A further improvement is that the inner insulating layer is made of silicone rubber, the outer insulating layer is made of high-hardness cross-linked polyethylene, and the filling layer is made of aramid fiber.

[0011] A further improvement is that the outer sheath is made of silicone rubber, the surface of the outer sheath is provided with diamond-shaped or wavy protrusions, and the inner wall of the outer sheath is coated with a layer of polytetrafluoroethylene with a low coefficient of friction.

[0012] A further improvement is that the crack-resistant buffer layer is made of nitrile rubber, and the environmentally friendly flame-retardant layer is made of halogen-free glass fiber spirally wound.

[0013] A further improvement is that the armor layer is a galvanized steel strip, which is wrapped around the outside of the crack-resistant buffer layer.

[0014] Compared with the prior art, the beneficial effects of this utility model are: (1) This utility model uses aluminum alloy wire tightly twisted together to form each conductor in the inner core. On the one hand, it ensures conductivity while reducing resistance and heat generation, thus reducing the risk of stress cracking caused by thermal expansion and contraction. On the other hand, due to its compact structure, it can better resist the influence of external forces during operation, reducing vibration caused by external forces, reducing the wear on the conductor surface, and helping to extend the service life of the conductor. By designing an insulation layer consisting of an inner insulation layer, an outer insulation layer, and a filling layer on the outside of the conductor, the design of the insulation layer can effectively disperse stress, buffer external impact, reduce friction and wear between the outer insulation layer and the inner insulation layer, and protect the inner layer structure. On the other hand, it improves the insulation performance and tear resistance of the entire inner core. The shielding layer is wrapped around the outside of the outer insulation layer. The shielding layer is made of aluminum foil and polyester composite tape. This design has the following advantages: on the one hand, the aluminum foil has a good shielding effect against low-frequency interference, and the polyester layer provides mechanical support to prevent the aluminum foil from breaking. On the other hand, the polyester layer enhances wear resistance, and the aluminum foil and the insulation layer are tightly bonded, further reducing the risk of cracking caused by bending.

[0015] (2) This utility model designs an outer sheath structure consisting of an outer sheath, a crack-resistant buffer layer, an environmentally friendly flame-retardant layer, and an armor layer. The crack-resistant buffer layer is made of nitrile rubber. On the one hand, the elastic recovery ability of this material can effectively absorb stress and reduce the risk of cracking due to fatigue; on the other hand, the tear strength of nitrile rubber is much higher than that of ordinary rubber, which can resist tearing caused by puncture by sharp objects or edge friction. The environmentally friendly flame-retardant layer is made of halogen-free glass fiber tape spirally wound to form a multi-layered barrier. This design can effectively isolate oxygen and heat transfer, slow down the spread of flame, and the spiral winding structure can offset the thermal shrinkage stress of the material at high temperatures, preventing the environmentally friendly flame-retardant layer from cracking or falling off; on the other hand, it can absorb mechanical impact energy, protect the internal conductor and insulation layer from damage, and reduce friction with the outer sheath, thereby extending the overall service life of the cable.

[0016] (3) This utility model designs the armor layer as a galvanized steel strip wrapped around the outside of the crack-resistant buffer layer. This material, in conjunction with the outer sheath, can effectively reduce the risk of the cable being punctured by sharp objects or bitten by animals, reduce power outages and maintenance frequency caused by external damage, and protect the internal structure of the cable. On the other hand, it can assist the outer sheath made of silicone rubber to conduct internal heat to the external environment, avoiding aging or performance degradation of the insulation material due to local overheating. Furthermore, the galvanized layer of the galvanized steel strip can prevent the steel strip from rusting. In conjunction with the application of the outer sheath, it can effectively block the intrusion of moisture and chemical substances such as acids, alkalis and salt spray, improve waterproofness, and thus extend the service life of the cable in harsh environments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the cable of this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the cable of this utility model.

[0018] Marked in the image: 1. Inner core; 11. Conductor; 12. Insulating layer; 121. Inner insulating layer; 122. Outer insulating layer; 123. Filling layer; 13. Shielding layer; 101. Lubricating layer; 2. Outer protective layer structure; 21. Outer sheath; 22. Crack-resistant buffer layer; 23. Environmentally friendly flame-retardant layer; 24. Armor layer; 201. Polytetrafluoroethylene coating. Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] like Figure 1 and Figure 2 As shown, a wear-resistant and crack-resistant environmentally friendly power cable includes an inner core 1, which includes a plurality of arrayed conductors 11, an insulation layer 12 disposed on each conductor 11, and a shielding layer 13 wrapped around the insulation layer 12. Specifically, each conductor 11 is made of tightly stranded aluminum alloy wire. In overhead transmission lines, this design ensures conductivity while reducing resistance heating, thus minimizing the risk of stress cracking due to thermal expansion and contraction. Furthermore, its compact structure better resists external forces during operation, reducing vibrations and wear on the conductor 11 surface. This helps extend the service life of the conductor 11 and improves the reliability and stability of power transmission. As a preferred embodiment, each conductor 11 is coated with a nanoscale lubricating layer 101, which is a graphene composite material, to reduce mechanical fatigue during long-term operation; In a preferred embodiment, the insulation layer 12 includes an inner insulation layer 121 wrapped around each conductor 11, an outer insulation layer 122 wrapped around the inner insulation layer 121, and a filler layer 123 disposed between the outer insulation layer 122 and the inner insulation layer 121. The inner insulation layer 121 is made of silicone rubber to buffer stress, the outer insulation layer 122 is made of high-hardness cross-linked polyethylene to resist external wear, and the filler layer 123 is made of aramid fiber. This design of the insulation layer 12 can effectively disperse stress, buffer external impact, reduce friction and wear between the outer insulation layer 122 and the inner insulation layer 121, and protect the inner structure. On the other hand, it improves the insulation performance and tear resistance of the entire core 1. As a preferred embodiment, the shielding layer 13 is wrapped around the outside of the insulating outer layer 122. The shielding layer 13 is made of aluminum foil and polyester composite tape. This design has the following advantages: on the one hand, the aluminum foil has a good shielding effect against low-frequency interference, and the polyester layer provides mechanical support to prevent the aluminum foil from breaking; on the other hand, the polyester layer enhances wear resistance, and the aluminum foil is tightly bonded to the insulating layer 12, further reducing the risk of cracking due to bending. The above describes the design of the inner core 1 of the cable base layer; The cable is also designed with an outer sheath structure 2: The outer sheath structure 2 is disposed outside the inner core 1. The outer sheath structure 2 includes an outer sheath 21, a crack-resistant buffer layer 22, an environmentally friendly flame-retardant layer 23, and an armor layer 24. The environmentally friendly flame-retardant layer 23 is disposed between the inner side of the outer sheath 21 and the outer side of the armor layer 24. The armor layer 24 is wrapped around the outer side of the crack-resistant buffer layer 22. The crack-resistant buffer layer 22 is wrapped around the outer side of the shielding layer 13. Specifically, the outer sheath 21 is made of silicone rubber. The surface of the outer sheath 21 is provided with diamond-shaped or wavy protrusions, which can increase the coefficient of friction while dispersing external forces. The inner wall of the outer sheath 21 is coated with a layer of polytetrafluoroethylene coating 201 with a low coefficient of friction, which can be used in conjunction with the outer sheath 21 to improve the chemical corrosion resistance of the outer sheath 21 and reduce frictional resistance. Specifically, the crack-resistant buffer layer 22 is made of nitrile rubber. On the one hand, the elastic recovery ability of this material can effectively absorb stress and reduce the risk of cracking due to fatigue; on the other hand, the tear strength of nitrile rubber is much higher than that of ordinary rubber, and it can resist tearing caused by puncture by sharp objects or edge friction. It should be noted that nitrile rubber can also have its friction coefficient optimized by adjusting the formulation, such as by adding fillers like carbon black and silica, thereby reducing surface wear while maintaining flexibility. For example, in mining drag chain cables, the wear of the nitrile rubber buffer layer is more than 60% lower than that of PVC. For example, in robot joint cables, nitrile rubber buffer layers can withstand millions of bending cycles without cracking. Specifically, the environmentally friendly flame-retardant layer 23 is made of halogen-free glass fiber tape spirally wound to form a multi-layered barrier. This design can effectively isolate oxygen and heat transfer, slow down the spread of flame, and the spiral winding structure can offset the thermal shrinkage stress of the material at high temperature, preventing the environmentally friendly flame-retardant layer 23 from cracking or falling off. On the other hand, it can absorb mechanical impact energy, protect the internal conductor 11 and insulation layer 12 from damage, and reduce friction with the outer sheath 21, thereby extending the overall service life of the cable. Specifically, the armor layer 24 is a galvanized steel strip wrapped around the outside of the crack-resistant buffer layer 22. This material, in conjunction with the outer sheath 21, effectively reduces the risk of the cable being punctured by sharp objects or bitten by animals, reducing power outages and maintenance frequency caused by external damage, and protecting the internal structure of the cable. On the other hand, it assists the silicone rubber outer sheath 21 in conducting internal heat to the external environment, preventing insulation material aging or performance degradation due to local overheating. Furthermore, the galvanized layer of the steel strip prevents rusting, and together with the outer sheath 21, effectively blocks the intrusion of moisture and chemicals such as acids, alkalis, and salt spray, improving waterproofing and thus extending the cable's service life in harsh environments.

[0021] In this embodiment, it should also be noted that the power cable in the application is manufactured using existing processes and is considered prior art, with its working principle already disclosed. This application only addresses the shortcomings of existing power cables in terms of low wear resistance and crack resistance, and does not involve improvements in other aspects. The working principle of this wear-resistant, crack-resistant, and environmentally friendly power cable is described below: This new cable design incorporates two improved design elements: Part 1: By tightly stranding aluminum alloy wire into each conductor 11 within the inner core 1, conductivity is ensured while reducing resistance and heat generation, thus minimizing the risk of stress cracking due to thermal expansion and contraction. Furthermore, its compact structure provides better resistance to external forces during operation, reducing vibrations and surface wear, thereby extending the lifespan of the conductors 11. The design of an insulation layer 12, consisting of an inner insulation layer 121, an outer insulation layer 122, and a filler layer 123, effectively disperses stress, buffers impacts, reduces friction and wear between the outer insulation layer 122 and the inner insulation layer 121, protecting the inner structure. This design also enhances the overall insulation performance and tear resistance of the inner core 1. The shielding layer 13 is wrapped around the outside of the insulating outer layer 122. The shielding layer 13 is made of aluminum foil and polyester composite tape. This design has the following advantages: on the one hand, the aluminum foil has a good shielding effect against low-frequency interference, and the polyester layer provides mechanical support to prevent the aluminum foil from being damaged; on the other hand, the polyester layer enhances wear resistance, and the aluminum foil is tightly bonded to the insulating layer 12, further reducing the risk of cracking caused by bending.

[0022] Part Two: The outer sheath structure 2 is designed by comprising an outer sheath 21, a crack-resistant buffer layer 22, an environmentally friendly flame-retardant layer 23, and an armor layer 24. The crack-resistant buffer layer 22 is made of nitrile rubber. This material's elastic recovery effectively absorbs stress, reducing the risk of cracking due to fatigue. Furthermore, nitrile rubber has a much higher tear strength than ordinary rubber, resisting tearing caused by punctures from sharp objects or edge friction. The environmentally friendly flame-retardant layer 23 uses halogen-free glass fiber tape spirally wound to form a multi-layered barrier. This design effectively isolates oxygen and heat transfer, slowing the spread of flame. The spiral winding structure also counteracts the thermal shrinkage stress of the material at high temperatures, preventing the environmentally friendly flame-retardant layer 23 from cracking or falling off. Additionally, it absorbs mechanical impact energy, protecting the internal conductor 11 and insulation layer 12 from damage, and reduces friction with the outer sheath 21, thereby extending the overall service life of the cable.

[0023] Furthermore, by designing the armor layer 24 as a galvanized steel strip wrapped around the crack-resistant buffer layer 22, this material, in conjunction with the outer sheath 21, effectively reduces the risk of the cable being punctured by sharp objects or bitten by animals, reducing power outages and maintenance frequency caused by external damage, and protecting the internal structure of the cable. On the other hand, it assists the silicone rubber outer sheath 21 in conducting internal heat to the external environment, preventing insulation material aging or performance degradation due to local overheating. Moreover, the galvanized layer of the steel strip prevents the steel strip from rusting, and together with the outer sheath 21, effectively blocks the intrusion of moisture and chemicals such as acids, alkalis, and salt spray, improving waterproofing and thus extending the service life of the cable in harsh environments.

[0024] In summary, by simultaneously improving and innovating the inner core 1 and the outer sheath structure 2, the wear resistance of the power cable can be enhanced, the structural strength of the cable can be improved, and the cable cracking and exposed core caused by bending and repeated dragging can be effectively avoided, thus significantly improving the service life of the cable.

[0025] The above embodiments are only used to illustrate the technical methods of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of this utility model without departing from the spirit and scope of the technical methods of this utility model.

Claims

1. A wear-resistant and crack-resistant environmentally friendly power cable, comprising an inner core (1), wherein the inner core (1) comprises a plurality of arrayed conductors (11), an insulation layer (12) disposed on each conductor (11), and a shielding layer (13) wrapped around the insulation layer (12). characterized in that The insulating layer (12) includes an inner insulating layer (121) wrapped around each conductor (11), an outer insulating layer (122) wrapped around the inner insulating layer (121), and a filling layer (123) disposed between the outer insulating layer (122) and the inner insulating layer (121). Also includes: The outer protective layer structure (2) is disposed outside the inner core (1). The outer protective layer structure (2) includes an outer sheath (21), a crack-resistant buffer layer (22), an environmentally friendly flame-retardant layer (23), and an armor layer (24). The environmentally friendly flame-retardant layer (23) is disposed between the inner side of the outer sheath (21) and the outer side of the armor layer (24). The armor layer (24) is wrapped around the outside of the crack-resistant buffer layer (22). The crack-resistant buffer layer (22) is wrapped around the outside of the shielding layer (13).

2. An abrasion resistant, anti-cracking, environmentally friendly power cable according to claim 1, characterized in that, Each of the conductors (11) is made of tightly twisted aluminum alloy wire.

3. An abrasion resistant, anti-cracking, environmentally friendly power cable according to claim 2, characterized in that, Each conductor (11) is coated with a nanoscale lubricating layer (101), which is a graphene composite material.

4. An abrasion resistant, anti-cracking, environmentally friendly power cable according to claim 1, characterized in that, The inner insulating layer (121) is made of silicone rubber, the outer insulating layer (122) is made of high-hardness cross-linked polyethylene, and the filler layer (123) is made of aramid fiber.

5. An eco-friendly, wear-resistant, and anti-cracking power cable according to claim 1, characterized in that, The outer sheath (21) is made of silicone rubber. The surface of the outer sheath (21) is provided with diamond-shaped or wavy protrusions. The inner wall of the outer sheath (21) is coated with a layer of polytetrafluoroethylene coating (201) with a low coefficient of friction.

6. An eco-friendly, wear-resistant, and anti-cracking power cable according to claim 1, characterized in that, The crack-resistant buffer layer (22) is made of nitrile rubber, and the environmentally friendly flame-retardant layer (23) is made of halogen-free glass fiber spiral wound.

7. An abrasion resistant, crack resistant, environmentally friendly power cable according to claim 6, characterized in that, The armor layer (24) is a galvanized steel strip that is wrapped around the outside of the crack-resistant buffer layer (22).

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